Hugh Orde expressed hope the events would be a "wake-up" call

Eighteen police officers and 11 others were injured during trouble at Friday night's Tour of the North parade.

The police are looking into a possible breach by protesters of a Parades Commission ruling.

Chief Constable Sir Hugh Orde said he did not think the violence augured badly for other parades this summer.

"Hopefully this will be seen as a wake-up call," he told the BBC's Politics Show on Sunday.

"No community I have spoken to wants to have a violent marching season.

"We have moved on from that. Last year, we had an hour and a half of extreme violence. But apart from that, the majority of the parades went off peacefully."

Trouble flared on Friday as three lodges, followed by supporters, went past Ardoyne shops on the Crumlin Road on the return leg of their parade.

Profile: The Orange Order

Missiles were thrown by nationalist protesters and there were clashes between police and protesters. Six petrol bombs were thrown. A teenager's arm was broken.

Three people were arrested.

Sir Hugh said those engaged in the violence were between 12 and 15 years old.

He said the Parades Commission was "bending over backwards" to find an accomodation.

But, he said, it was not up to the police to solve the problems.

"The solution to this is not a police solution," he said.

"The solution to this is the two communities speaking to each other, engaging and coming together with different perspectives on what people should be allowed to do."

The police are to examine CCTV footage from the scene.

The march was the first to be affected by an extension of the law governing the behaviour of parade supporters.

It gave police wider powers to control the movement and behaviour of parade followers at flashpoint areas.

The Tour of the North was among the first of a series of parades by Protestant Orangemen which culminate in the biggest demonstrations on 12 July.